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Are you sure you cannot run this InstallUtil.exe application from a command prompt? That should leave the error message on your command prompt window to evaluate. We used an app2service utility in the past and if I remember it was a command prompt utility and did not have a graphical interface at all. It may be the same case with this utility.

I ran the file from a command prompt and all it did was give me a list of possible paramaters. I tried using /i but it didn't do anything and none of the paramaters I seen had anything to do with installing.